i would suspect the 1.4 as the choice for the spark, and the aveo to have the 1.8 and 1.4t just like the cruze.. but that is me. And only because they went up in size from the current aveo, i highly doubt it would be offered with less hp. (100hp 1.4), qnd i believe with the 6 speed the 1.8 will get better fuel mileage numbers.
Hopefully the gm website is wrong, and both are offered with a 1.4t and speed manual. Because i cant find a way to make that car on gms website with the cruse.. (that set up in the RS edition only would be fine)..